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In page The Waterfront:

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The Pump House is the location of the landing of the Pinkertons who navigated the river in 1892 with the intention to provide security at the plant that was subject to a labor strike of the Amalgamated Association of Iron and Steel Workers at the instruction of Henry Clay Frick. The battle that followed, known as the Homestead Strike / Battle of Homestead, left sixteen people dead (23 wounded) and set back the cause of organizing the iron and steel industry in Pittsburgh for decades. The Battle of Homestead is one of the most noted strikes in American Labor History.